Legacies is ok, but this issue even has more problems than the others. It seems like it cannot really decide what it's supposed to be. On one hand it seems to be a version of the modern history of the current DCU, which would be fine. On the other, it's a meta-fictional history, explaining superhero continuity and publishing trends through a story such as the fall of the GA heroes, the rise of the detective heroes and western stars (using television to stand in for comics, and the coonskin hat craze explained as a Tomahawk fad...). Except for the fact that the timeline in this issue is all sorts of screwed up. If the kid was around 8-12 in 1939, this story (and many of the characters used and referenced events) suggest that it's taking place in the 1950s. Which is fine when talking about the rise of the cowboy heroes after the GA masked men mostly leave the stage. But, the story then basically implies that the Silver-Age heroes Superman, Batman, Wonder Woman, Aquaman, Green Lantern and the Flash all debuted in the mid to late 1950s. Which is true publishing wise (for Green Lantern and the Flash anyways, the other four never really left), but no way that jibes with modern continuity! And, considering the age of the narrator, that means that he would have to be narrating from some point in the future, or we're going to acknowledge on some level that the modern heroes have been active for 50-60 years!
Not really impressed with Robinson's JSA story. We have have a wildly inappropriate comment between Mr. America and Lightning, Wildcat doing the cliched "poor me with no superpowers but a good left-hook and on an adventure involving magic/superpowers/etc" monologue, Obsidian taken over right after a whole arc whose ultimate issue was about how he'd never be taken over again, Dr. Mid-nite getting sidelined out of an adventure in order to do real doctoring yet again, and by the end, the story's main heroes being just legacy heroes as all the originals or primary ones taken out. And, conflicting accounts as to how the starheart's possessions work. Is it random, possibly targeting anyone with a modicum of superpowers, or just the ones powered by starheart/chaotic energy? As the majority of the team that Batman nee Nightwing nee Robin are superpowered, exactly what is his logic that these heroes are the least susceptible, when the start of the comic points out that it is targeting even those with very little super power? There's no internal logic to it.